Tool holder



y 1942- D. H. MONTGOMERY EI'AL 2,281,706

TOOL HOLDER Original Filed March 28, 1936 .Q Q Q N. S fld m w :2 AER: WN. l v Q I NM N NM mw w INVENTORS MONTGOMERY 650265 A.

DONALD If.

A I C RDELL ATTORNEYS Patented May 5, 1942 TOOL HOLDER Donald H.Montgomery,

George A. Cardell, New signors, by mesne assi gnments,

West Hartford, and Britain, Conn., as to The New Britain MachineCompany, New Britain, Conn., a corporation of Connecticut Originalapplication Ma 71,428. Divided and her 23, 1939, Serial No 1 Claim.

The invention relates to a tool holding device, and this application isa division of our co-pending application, Serial No. 71,428, filed March28, 1936, now Patent No. 2,174,860, dated October 3, 1939.

As is well known chips often collect and wind around the tools and toolholders of metal working machines. It is frequently necessary to stopthe machine for the purpose of freeing the tools, tool holders andslides of an accumulation of such chips.

It is an object of this invention to provide an improved form of toolholding device to reduce to a minimum the liability of the collection ofchips thereon.

More specifically it is an object of the invention to provide a toolholder having downwardly sloping surfaces to induce chips fallingthereon to slide ofi.

In the drawing which shows, for illustrative purposes only, a preferredform of the invention- Fig. l is a top plan view of a tool holdingdevice illustrative of the invention;

Fig. 2 is a side view of the tool holding device of Fig. 1;

Fig. 3 is a rear end view of the tool holding device shown in Figs. 1and 2; and

Fig. 4 is an enlarged fragmentary sectional view taken substantially inthe plane of the line 4--4 of Fig. 2.

In the form shown 5 indicates a rigid bearing stud carried by the frameof the machine and serving as the slide support for a cross slide 6, allas is more fully set forth in Gridley et a1. Patent No. 2,055,435,September 22, 1936. The cross slide 6 is fed on its stud 5 by cam means(not herein shown) and is guided against rotation on the stud 5 by meansof an upstanding arm I, having interengagement with the frame, notherein shown but illustrated in said Gridley et a1 Patent.

A base plate 8 rests on the cross slide 6 and in the form shown ispivoted thereto, as by means of a stud 9. The base plate 8 is rigidlyheld to the cross slide by means of screws Ill-l0, having a loose fit inthe counterbored opening in the base plate 8, so that the latter may beadjusted angularly to a slight extent about the stud 9 as a pivot. Inorder to adjust the plate 8 angularly on the cross slide 6 the plate maybe bored for the reception of a pair of adjusting pins, such as H, whichengage an upstanding part of the slide 6, as will be clear from Fig. 3.Headless screws l2, engaging a threaded opening rch 28, 1936, Serial No.

this application Septemin the base plate 8, serve to force the adjustingpins H into engagement with the slide 6 and accurately to determine theangular position of the base plate 8 on the cross slide, after which thescrews It may be tightened up and the base 9 will then be securely heldin its adjusted position on the slide 6.

The base plate 8 is provided with a dovetail slot [3, having undercutsurfaces |4l5. A supplementary base plate l6 fits flatwise on the baseplate 8 and is provided with parts to interfit with the slot l3 tosecurely hold the plate I6 in place, as is more fully set forth in theparent application aforesaid.

The plate I6 is provided on top with a dovetail groove 24 (Fig. 4),positioned at right angles to the slot l3 in the base 8 upon which itfits. A tool holder 25 fits flatwise on the slide lfi'and is providedwith a projection 26, having a dovetail surface 21 to interfit with theadjacent side of the dovetail slot 24. At the side opposite the surface21 there is a clamping member including a clamping nose 28 and an ear29, said members being pivoted on a pin 30 and adjustable by means of aclamping or adjusting screw 3|. The tool holder 25 may thus be held verysecurely and rigidly but adjustably on the plate I6 by rocking the ear29 to cause the nose 28 engaging beneath the undercut on plate [6 todraw or cam the tool holder 25 down on the plate I6.

The tool holder is generally slabbed bit, as indicated at 32-32, on thesides and at 33 on the front and the surfaces of the plate are likewiseslabbed off, so that there is little likelihood that chips will lodgeupon the surface of the tool holder or the parts upon which it iscarried. The rear top surface is also slabbed off at 33, to cause chipsfalling on such surface to slide off. The tool itself in the form shownis a circular forming tool 34, secured as by means of a bolt 35 to aforwardly projecting flange member 35 on the tool holder 25.

It will be seen that since the base plate 8 can be angularly adjustedthe tool 34 carried thereby is also capable of angular adjustment.Furthermore, the tool 34 may be moved longitudinally of the work byreason of the dovetail connection between the plates 8 and I6, and thetool may be moved transversely of the work by means of the dovetailconnection illustrated in Fig. 4. All of these movements are adjustingmovements and are, of course, independent of the main feeding movementof the tool slide.

The parts may be very accurately adjusted by very simple means. Theadjusting means, that rigidly clamp the adjusting block 35 in place i vthe slot and adjacent to the tool holder or part to be adjusted. Theadjusting block 36 carries an adjusting screw M and an adjusting thumbnut 42, the latter being held in adjusted rotative position by means ofa spring finger 43, engaging in various notches in the periphery of thethumb nut Q2, as will be understood.

The thumb nut 42 carries a projectingpinad mounted eccentrically thereinand the screw. M

has an eccentric hole therein to slidably receivev the pin 44. The thumbnut 42 is sustained against longitudinal movement, by a transverse pin45 engaging in a circumferential groove in the shank, so that whenthethumb nut isturned it doessnot move longitudinally but by means of theeccentric pin 44 slidably fitting the hole in the screw ll the latter isrotated and advanced or retracted for adjusting the position of thetool.

The tool holder,25 or the part to be adjusted may be moved toapproximate position and very lightly tightened. The final adjustmentmay then be accomplished by securing the block 36 in approximatevposition and then turning the thumb nut 42 so as to cause the screw Mto very slowly move the part, such as the tool holder, to be adjusted.When adjustment has been effected the tool holder is rigidly clamped inplace by means of the .clampingscrew 31, as heretofore described. Theadjustment for the plate It on the plate 8 may be identical with theadjusting means just described and no separate description thereof needbe given.

Since the dovetail slots and dovetails are all preferably of the samesize the various dovetails are interchangeable with the various dovetailmerely backed off and the tool holder 35 carrying the tool 34 with it issimply rocked, that is, by

raising the side where the screw 3| is located the tool holder willpivot on the plate It about the point 50 andthe nose 28 will slip out ofthe dovetail slot '24. When the tool has been reground the tool holdermay be replaced by rocking the same into place and by backing the toolholder into the adjusting screw M and then turning up on .theclampingscrew 3| it is assured that the tool holder will be in the same positionit was in before removal.

It is to be understood that, aside from the adjusting nuts 42, all ofthe clamping screws, etc., are housed or not projecting, so that thedevice may be said to be in effect streamlined, so that chips willreadily fall away from the tool and down into the chip pan.

While the invention has been described in (302%- siderable detail and .apreferred form shown it is to be understood that various changes andmodifications may be made within the scope of the invention as definedin the appended claim.

We claim:

In a device of the character indicated, a block of metal having agenerally rectangular base, means for securing said base to a support,said block being of generally frusto-pyramidal form, a flange memberintegral with and projecting forwardly from the front flat side of saidgenerally -frusto-pyramidal block, the top of said flange being asubstantial continuation of the top of said block, and means forsecuring a tool to said forwardly projecting flange.

DONALD H. MONTGOMERY. GEORGE A. CARDELL.

